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Perth · Fremantle
Solar and battery guidance for Fremantle's coastal heritage homes. Salt air and planning rules shape installation choice, and compact battery options suit older properties.
Quick answer
A typical Fremantle home uses 15-20 kWh a day and suits 5-8 kW of solar with a 10-13.5 kWh battery. At current Synergy rates that setup saves about $1,800 a year, and the WA Battery Scheme covers up to $1,300 of the battery.
Sources: SBP suburb estimates · Synergy A1 33.26c/kWh · WA Battery Scheme · Fremantle yield 1,620 kWh/kW
What-if simulator. Drag the timeline + sliders to see how a system would behave on a typical Fremantle day. Weather + grid status update live when the APIs are reachable.
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W/m² irradiance
0 kW
Est. generation now
22.2 kWh
Avg daily yield
Household Type
Annual savings
$1,796
Monthly average
$150
Solar used at home
4,806 kWh/yr
Exported to grid
3,294 kWh/yr
Based on 5 kW solar × 5.1 sun hours × Perth derate, with a 10 kWh battery offsetting peak-rate Synergy A1 usage and exporting the surplus at DEBS peak/off-peak rates. Real savings depend on your specific tariff plan, usage pattern, and installation — an installer confirms the final quote.
Monthly Savings
~$150
Based on 5kW system, 70% self-consumption, 33c/kWh
Sun Hours
5.1 hrs/day
Annual average peak sun hours for Fremantle
DEBS Peak Window
3pm–9pm
Export at 10c/kWh during peak, 2c/kWh off-peak
Western Power Grid: Normal
No planned outages for Fremantle (6160). Network operating normally.
1,227
Solar systems
7.4
MW installed
6 kW
Avg system
Based on Clean Energy Regulator data for postcode 6160. WA has 580,796 registered solar installations totalling 3.33 GW, the highest per-capita rooftop solar adoption rate in Australia.
Data to July 2026. Licensed from the Clean Energy Regulator, Commonwealth of Australia under a Creative Commons Attribution 4.0 licence.
Standard home
10–13.5 kWh
Large home
13.5–20 kWh
Retrofit option: Compact AC-coupled units suit tight roof space + indoor placement
Capacity ranges only — Find My Battery shows you options for the specific brand and model that fits your situation.
Backup Battery: Recommended
Southern metro suburbs have slightly above-average outage frequency. A battery with backup capability keeps essential circuits running during summer storms, which cause most unplanned outages in this zone.
85
SAIDI (min/yr)
1.1
Outages/yr
77
Avg duration (min)
Pass
ERA benchmark
Common outage causes in this zone:
Backup battery sizing for Fremantle:
With an average outage duration of 77 minutes (1.3 hours), a 5 kWh backup-capable battery is typically sufficient to maintain essential loads (lights, fridge, internet, medical equipment). For whole-home backup during longer outages, consider 10-13.5 kWh with backup capability.
Statewide support
WA Battery Scheme
Capped at 10 kWh, Synergy customers
$1,300
up to
Federal STCs
13.5 kWh battery example. 6.8 STCs/kWh times ~$39.9
~$3,631
rebate
Interest-free loan
Available alongside the rebate for eligible households
$10k
up to
Rebates also apply to retrofit installations on existing solar.
Ongoing earnings
Synergy Battery Rewards
Up to 30 dispatch events a year, 2-4 hours each
30
events/yr
Event payment
Paid per kWh your battery exports during a dispatch event
$0.70
per kWh
Typical annual earnings
For a 10-13 kWh battery across 15-25 events at 70c/kWh
~$100-180
per year
VPP enrolment is mandatory for the WA battery rebate from May 2026.
Compare quotes from SAA-accredited local installers — you choose which to act on. No obligation, no pressure.
Tell us about your home and energy use. We connect you with verified WA installers covering Fremantle for free, no-obligation quotes.
Get free quotes →AS/NZS 5139 clearance rules, garage vs outdoor walls, and what installers check on-site.
A step-by-step method covering evening usage and seasonal AC demand.
Activation events credit 70¢/kWh on top of DEBS exports, and signing up is a WA rebate condition.
